1. Year 3 (National Numeracy Strategy) (Based on DFEE Sample Lessons)
Dr Fog Presents
Maths vocabulary
and practising
mental calculations
Year 3 (National Numeracy Strategy)
(Based on DFEE Sample Lessons)

2. Resources
Sheets of A4 paper with a number written in large digits on each.

3. Mental Learning Objective
Understand the vocabulary of addition and subtraction.

4. Mental Learning Task Today we are going to practise counting.
When you know the answer, start chanting along with me….

5. Mental Learning Task 5 10 15 20 25 30 35
Keep going!

6. Mental Learning Task We added on 5 or increasing by 5
What was the rule?
We added on 5
or increasing by 5

7. Mental Learning Task 31 28 25 22 19 16 13
Keep going!

8. Mental Learning Task We counted back 3 or decreasing by 3
What was the rule this time?
We counted back 3
or decreasing by 3

9. Words about taking away.
Mental Learning Task
Today we are going to look at words about adding and taking away.
Words about adding
Words about taking away.

10. Words about taking away.
Mental Learning Task
Write words in the stars about adding and taking away.
Words about adding
Words about taking away.

11. Words about taking away.
Mental Learning Task
I need two volunteers.
Each must choose a number.
Words about adding
Words about taking away.

12. Words about taking away.
Mental Learning Task
Someone now must choose a words from one of the stars.
Words about adding
Words about taking away.

13. Words about taking away.
Mental Learning Task
Who can make a number sentence using these numbers and words?
Words about adding
Words about taking away.

14. Words about taking away.
Mental Learning Task
Use different words and numbers. How many number sentences can you make?
Words about adding
Words about taking away.

15. Words about taking away.
Mental Learning Task
Write down three different number sentences.
Words about adding
Words about taking away.

16. Mental Learning Objective
Understand the vocabulary of addition and subtraction.

17. Main Learning Objective
I can show instant recall of addition and subtraction facts.
I can practise different mental calculation strategies.

18. or subtract a two-digit
Key idea
If you need to add
or subtract a two-digit
number you can start
with either the tens
or the units digit.

19. Main Learning Task
Today we will be working in threes (trios) and on our own (individuals) in our normal maths groups.

20. Main Learning Task One pupil write down an equation.
The other two copy it and work out the answer.
The first pupil looks at both answers and decides which is correct.

21. Main Learning Task
If the first pupil decides they are not correct, or if the answers do not agree, all three pupils check the calculations until they agree an answer.
They then swap jobs so everyone can choose a sum.

22. Main Learning Task Group 1:- Simplest The starting number is under 50.
Children can add or takeaway a single- digit number.

23. Main Learning Task Group 2:- Middle
The starting range is in the range.
Pupils add or subtract a number in the 10 – 20 range.

24. Main Learning Task Group 3:- Hardest The starting number is 150.
Pupils add or subtract a number between 10 and 50.

25. Main Learning Task Solve these questions silently 17 -  = 4
= 
 - 12 = 12
13 +  = 13
= 
30 -  = 21
 + 3 = 10
14 +  = 20
20 -  = 11
= 
23 -  = 18
= 
16 -  = 6
12 – 4 = 

26. Main Learning Task Mark your work while the teacher gives the answers,
17 -  = 4
= 
 - 12 = 12
13 +  = 13
= 
30 -  = 21
 + 3 = 10
14 +  = 20
20 -  = 11
= 
23 -  = 18
= 
16 -  = 6
12 – 4 = 

27. Main Learning Objective
I can show instant recall of addition and subtraction facts.
I can practise different mental calculation strategies.

28. Plenary Which pairs of numbers are easy to add?
Which pairs of numbers are not easy to add?
Why not?

29. Plenary If the starting number is 50… I want to add 11….
How could I do this?
How else could I do it?

30. Plenary If the starting number was 50….. I want to add 19…
How could I do this?
How else could I do this?

31. Plenary If the starting number is 51 and I want to add 18...
how do I do it?

32. Plenary If the starting number is 55 and I want to add 18...
how do I do it?

33. Review of Key Idea
If you need to add or subtract a two-digit number you can start with either the tens digit or the units digit.
Do you learn this today?

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